The nova-lxd repo no longer maintains a stable/newton branch. This change updates our checkout in developer mode to use the "newton-eol" tag. Depends-On: Ia3009901d63068b379f22d587efcba996f47b844 Change-Id: Ica08c8815c087154dc42a46de197ad1a2d398dfb Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>